/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-hover: #0B3B66;
      --accent: #00A884;
      --coral: #FF6B4A;
      --dark-navy: #0A192F;
      --slate-bg: #F8FAFC;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }
    body {
      color: #334155;
      background-color: #FFFFFF;
      line-height: 1.75;
    }
    .code-syntax {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(10, 25, 47, 0.95) 0%, rgba(15, 76, 129, 0.90) 100%);
    }
    .text-balance {
      text-wrap: balance;
    }
    .faq-panel {
      transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }